반응 #46671

반응 방정식

sodium hydrogencarbonate

t-butyl acetoacetate

sodium hydride

4-(chloromethyl)pyridine hydrochloride

→

ethyl 2-acetyl-3-(4-pyridyl)propionate

수율 19.9%

용매

N,N-dimethylformamide

N,N-dimethylformamide

반응 조건

후처리

1. 1
   온도cooling
2. 2
   workup.WAITAfter two hours
3. 3
   추출the whole was extracted with ethyl acetate (100 ml)
4. 4
   세척The organic layer was washed with water (100 ml) and saturated brine (50 ml) successively
5. 5
   건조dried over anhydrous sodium sulfate
6. 6
   농축concentrated under reduced pressure
7. 7
   기타The residue was purified by silica gel column chromatography

실험 절차

Anhydrous N,N-dimethylformamide (41 ml) was added to sodium hydride (2.81 g, 70.3 mmol) under a nitrogen atmosphere, and the mixture was stirred under ice-cold water-cooling. A solution of t-butyl acetoacetate (6.33 g, 40.0 mmol) in N,N-dimethylformamide (20 ml) was added dropwise to the mixture over 10 minutes, further after 10 minutes, 4-(chloromethyl)pyridine hydrochloride (5.00 g, 30.5 mmol) was added thereto little by little over three minutes under a nitrogen stream, and the temperature was raised to room temperature. After two hours, a saturated aqueous sodium hydrogencarbonate solution (150 ml) was added to the reaction mixture, and the whole was extracted with ethyl acetate (100 ml). The organic layer was washed with water (100 ml) and saturated brine (50 ml) successively, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography to give ethyl 2-acetyl-3-(4-pyridyl)propionate (1.34 g, 18%) as a pale yellow oily matter.

출처